Yes, you will lose the qualifying widow filing status as you must have a dependent child the year after your spouse has deceased. Even though you can select Widow, there will be a series of questions and your tax rate will be calculated as a Single person. You will then claim Single on your Form W-4 for 2024. You can find more information here:
https://apps.irs.gov/app/vita/content/globalmedia/4491_filing_status.pdf
